Until making a btc transaction becomes as fast and easy as swiping a debit/credit card at a point of sale, there is absolutely no motivation for customers to switch currencies. The infrastructure is already there; why reinvent the wheel? I agree btc is the more efficient choice, but unfortunately, it has a lot of usability issues to sort before it's ready for the prime time.
Maybe youre right, using debit/credit cards in real life is a lot more easier than bitcoin. Its still not as popular and widely used as other currencies to buy daily needs directly, but in the future, this will completely change.
As the ability of making money online using bitcoin is simpler than other currencies especially getting profit from it, people are starting to pay attention to it and using it, and we can say that bitcoin has a huge potential for the future ahead.